Go to Mission directly; one of my speaker cable terminals was broken by accident on my 733i floorstanders and they sent out a replacement within a week. Excellent service. They have a contact email and will get back to you pretty quickly with an answer.
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What audio source you put into your Amp? you can lower the source volume also the amp volume to confirm, where the problem come.
Source input is also important whether you using low level or hi level input.
Unless the company that made the speakers machined the allen screws themselfs, I'm sure any standard or metric allen set will work. Just becareful of the bracket because it may be glued to the speaker frame or there might be a gasket between the 2.
There will be a some wires coming from the crossover that will lead to the tweeters and to the woofer. They are terminated with female connectors that will slide on to the male end on the speakers. If the speakers that you are getting are from the same manufacture, then they should have the same fittings. If not, you may have to replace the females to match. It's a simple strip and crimp process.
Just make sure to mark the wires so you know which one is pos and neg. If you mix them it will throw your speakers out of phase and they won't sound right.
Hope this helps.
Some basic trouble shooting is required here. First you need to see if it is a problem from your source or the sub. Try a different source to the sub-woofer and see if it changes the response. If still nothing on the sub, then most likely there is an issue with the amp or driver. Check to see if there is a fuse on the sub, if so, it could be blown. There could also be an issue with the auto switching circuit on the subs amp, in that case, it would need to be repaired in the shop. But before that I would check all of the connections to the sub, and also to the driver in the cabinet. If everything looks good, then put some type of source directly to the woofer to see if it works, if you get sound, then looks like the amp has a problem. Again a repair or replace issue.
If you can get the same woofers, then yes you should be OK, pull the units, get the part number off the back and then try Google for a source. If you can't find a exact replacement then you are looking at replacing all of the woofers, rule of thumb is that you do not want to mix speakers, you end up having one speaker sounding different than the other, so what ever you do to one, you need to do to the other. In that way what tonal changes that happen will happen to both speakers and they remain matched.
Now if you need to find replacements, you need to replace with like impedance speakers, and try to find a speaker very similar to what you are replacing. Just don't throw anything in the cabinet, if the impedance isn't correct not only the sound could be bad, but you could also damage your Amp or Receiver.
I'm guessing you mean one of the bass drivers (as standmount or floorstanding speakers don't have subs as such). Place your hand lightly against the driver when playing some music at normal volume, there should be some vibration (this increases the louder you play). If there's no vibration, you're probably right.
Contact Mission, who can send you a new driver, contact a Mission dealer to see how much it'll cost to go through the dealer network. I'd recommend going down the latter route if you are unsure of what to do yourself.
Just noticed you posted this in March, in which case, I hope you got it fixed (or are enjoying your new pair instead!).
If these are Mission 780s your talking about, you're not the only one. The woofers supplied with the speakers originally have a known design/manufacturing flaw causing them to go "open circuit" after a few years use.
The good news is that IAG (who now own Mission) can supply you with a pair of replacements for about £45 plus postage. (You'd be forgiven for thinking they should supply the replacements for free given the cost of these speakers new and the fact this is a design/manufacturing fault).
Replacing your woofers is easy. Take off the front baffle. Remove the four rubber plugs that the baffle attaches too, and take out the 4 screws you'll find behind them. Now ease off the plastic moulded front pannel. Remove the four screws holding the woofer in place. Pull the spade connectors from their tags on the back of the speaker. Put the new woofer in by following this proceedure in reverse.